What This Port Is
Port 1752 sits in the registered ports range (1024-49151). These ports are assigned by IANA on request, historically meaning some organization filled out a form, named a service, and claimed the number. That's what happened here.
IANA's records list port 1752 as lofr-lm, the "Leap of Faith Research License Manager," registered for both TCP and UDP. The registrant, Leap of Faith Research, was a health informatics company. Their current public-facing work revolves around drug telemonitoring and digital health consulting. The license manager that claimed port 1752 appears to be long gone, with no documentation, downloads, or active users surfacing anywhere.1
This is not unusual. Thousands of registered ports point to products that were deprecated, abandoned, or never widely deployed. IANA's registry doesn't expire. The ghost stays on the list.
What "Registered" Actually Means
The registered range is not the well-known ports (0-1023), where running an HTTP server on port 80 or SSH on port 22 has real meaning. In the registered range, a registration means someone once asked for it. It doesn't mean:
- The software is still active
- Anything is listening on this port on your system
- The port has any privileged status
In practice, port 1752 is unoccupied on virtually every machine. If you see something listening here, it's an application that chose this port for its own reasons, unrelated to the IANA entry.
What Might Actually Use This Port
Occasionally, software chooses ports in this range informally, especially:
- License managers (FlexLM, LM-X, and similar tools that float ports dynamically)
- Internal services configured to use arbitrary registered ports
- Malware that picks obscure ports to blend into noise
If you find port 1752 open on a machine you manage and you didn't configure it, check what's there.
How to Check What's Listening
On Linux or macOS:
On Windows:
The process ID in the output lets you identify the application using your system's process manager or tasklist on Windows.
Why These Ports Matter
The 48,000+ registered ports are a graveyard and a commons. Most are quiet. Some are occupied by critical infrastructure. A few hold names attached to software no one remembers. The system works because applications generally respect registered assignments, which keeps collisions rare and troubleshooting possible.
Port 1752 is one of the quiet ones. The registration is a historical footnote. If you find traffic here, something is using it by choice, not convention.
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